Mud Cracks Indicate an Episode of Deposition and Perhaps Flooding

question 32

True/False

Mud cracks indicate an episode of deposition and perhaps flooding followed by drier conditions.

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Definitions:

Dosage Compensation

Genetic mechanism by which the expression of X-linked genes is made equivalent in XX females and XY males; in mammals this is accomplished by rendering all but one X chromosome inactive.

X Chromosome Inactivation

A process by which one of the copies of the X chromosome present in female mammals is inactivated, ensuring that males and females have the same dose of the X chromosome genes.

X Chromosome Inactivation Center (XIC)

A critical region on the X chromosome that controls the process of X chromosome inactivation during female development.

Codominance

A genetic scenario where two alleles of a gene pair in a heterozygote are fully expressed, resulting in offspring with a phenotype that is neither dominant nor recessive.